The first consideration when deciding on an outdoor fireplace design is whether your outdoor fireplace will be portable or permanent. Portable outdoor fireplaces obviously provide for virtually unlimited choice in terms of placement in your backyard or on your deck, and they now come in a number of different designs and finishes to suit just about any style of outdoor living space.
On the other hand, a permanent outdoor fireplace can add a real hint of luxury to your backyard or deck. Built-in or permanent outdoor fireplaces tend to require more extensive construction and are therefore generally more expensive than freestanding outdoor fireplaces.
Common materials for freestanding or built-in outdoor fireplaces are stone, stucco, tile and brick. You'll have plenty of designs to choose from, and matching your backyard or deck's overall design shouldn't be a problem. Outdoor fireplaces should always be located away from any potentially flammable items like trees or shrubs, and you should always use a spark guard and flame-resistant fire mat when your fireplace is in use. Also, be sure to check with your local fire department regarding their outdoor fire codes before installing your outdoor fireplace.